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EN-10219-2：20067Measurementofsizeandshape
7.20utsidedimensions
7.3 Thickness
CNCA-C10-01：2014 强制性产品认证实施规则照明电器Dimensions in milimetres
This dimension is a maximum when measuring B or H and a minimum when measuring 7
Froundness (O) of a circular hollow section shall be calculated from the following equation, but see pilingtube
7.5Concavityandconvexity
oncavityandconvexity
The concavity (xi) or the convexity (x2) of the sides of a square or rectangular hollow section shall b measured as shown in Figure 2. The percentage concavity or convexity shall be caiculated as follows: 1×100%;2×100%:×100%:2×100%
The deviation from squareness of the sides of a square or rectangular hollow section shall be m thedifferencebetween9o°and as shown in Figure 3
7 Externalcornerprofil
The external corner profile of a square or rectangular hollow section shall be measured according to 7.7.2 or 7.7.3 at the discretion of the manufacturer. 7.7.2The corner arc shall be measured with a radius gauge.
7.7.3The distance between the intersection of the flat side and the corner arc and the interse projections of the flat sides to the corner (C and C, in Figure 4) shall be measured.
utside corner profile of square or rectangular hollow
against the surface. At the opposite end of the hollow section the difference in height of the two lower corners from the horizontal surface (see Figure 5) shallbe determined
e5Twistofsquareorrectangularhollowsections
7.8.3 The twist shallbe measured with a spirit level and micrometer gauge (screw). The refereno the spirit level shall be the distance between the intersection of the fiat sides and the corner Figure 6). The twist Vis the difference between the values V, (see Figure 6) measured at each hollowsection
.0.3 The twist shall be measured with a spirit level and micrometer gauge (screw). The reference length of the spirit level shall be the distance between the intersection of the flat sides and the corner arcs (see Figure 6). The twist V is the difference between the values V, (see Figure 6) measured at each end of the hollowsection
7.9Straightness
7.9Straightness
The deviation from straightness (e) of the total length of a hollow section shall be measured at the poin maximum departure of the hollow section from a straight line connecting its two ends, as shown in Figur where L is the manufacturer's delivered length. The percentage deviation from straightness shall be calcula asfollows
from a straight line length L of 1 m, shall be not more than 3 mm
The nominal sectional properties of hollow sections within the scope of this part of EN 10219 and manufactured to the dimensional tolerances of this standard, required for the purposes of structural design, shall be calculated in accordance with Annex B. The sectional properties for a limited range of standard sizes of coldformed hollow sections are given in Table C.1 for circular sections, Table C.2 for square sections and Table C.3 for rectangular sections. These sectional properties were calculated from the formulae given in Annex B.
enominal sectional properties of hollow sections within the scope of this part of EN 10219 and nufactured to the dimensional tolerances of this standard, required for the purposes of structural design, allbecalculated inaccordancewithAnnexB. e sectional properties for a limited range of standard sizes of cold formed hollow sections are given in Table for circular sections, Table C.2 for square sections and Table C.3 for rectangular sections. These ctional properties were calculated from the formulae given in Annex B.
A.1 General
AnnexA (informative)
Additionaltolerancesforpilingtube
A.2Outof roundness tolerance
TableA.1 Maximumpermittedvaiues Dimensions inmm
A.3Accidentaleccentricity tolerance
accidental eccentricity ea should satisfy thecondition
eccentricity es,ma
A.4Dimpletolerance
The depth of initial dimples in the tube wall w。 is measured, in both the meridontal and circumferential directions, using a measurement gauge, see Figure A.3, of length Ig where: a)meridontally and circumferentially lg= 4/rT b)across welds lg = 25 T but l, ≤ 500 mm The gauge used for meridontal measurements should be straight but that used for measurements in the circumferentialdirection should havea radius of curvature rwhere 2
Dimensions in mm
B.1 General
Annex B (normative)
aeforthecalculationofsectionalprop
Iables C.1, C.2 and C.3 of this standard give nominal sectional properties for a limited range of sizes of cold formed hollow sections.The nominal sectional properties of holiow sections supplied to the requirements of this standard shall be calculated using the formulae given below. NOTE The designation of the sections' major axis (y) and its minor axis (zz) align with the axis designation used for structural design in the structural Eurocodes. This is a change from previous axis desionations
bles C.1, C.2 and C.3 of this standard give nominal sectional properties for a limited range of sizes of cold med hollow sections. The nominal sectional properties of holiow sections supplied to the requirements of s standard shall be calculated using theformulae given below. TE The designation of the sections' major axis (y) and its minor axis (zz) align with the axis designation used for uctural design in the structural Eurocodes. This is a change from previous axis designations
B.2 Circular hollow sections
Ine sectional properties for circular hollow sections in Table C.1 are calculated using the formulae given below.
DB21T 2378-2014 移动实验室 供、排水系统设计指南B.3Rectangular,orsquare,hollowsections
pupericial area per metre lengtr
Mass per unit length Second moment of area
(cm) (cm")
K=2A. h R=o+r 2
Sectionalpropertiesforalimitedrangeofstandardsizes
JJG(交通) 110-2012 车载式道路几何数据仪able Nominaldime sections (see Figure C.1)
Figure C.2Square hollow section
mensions and sectional properties of a limited range sections (see Figure C.3)